Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
emilynewhomeMay 1, 2008. My builder wants to use 'oriented strand board' for the roof decking. He says it's superior to plywood due to the marine glue used and interlocking strands.We are using OSB on the walls. My online research recommends plywood as it is smoother and gives a better base for shingle layment.